Wildensbuch lookout tower, Wooden observation tower in Trüllikon, Switzerland.

Wildensbuch lookout tower is a wooden observation structure in Trüllikon that rises about 37 meters, supported by four Douglas fir trunks as its main framework. The viewing platform sits at about 33 meters and provides space for visitors to take in the surrounding landscape.

Authorities built signal towers at this location in 1650 as part of a network of about 23 towers across the Zurich region to relay messages quickly. The present Wildensbuch tower continues this long tradition of watching and communication.

The tower was built as a joint project of the former Zivilgemeinde Wildensbuch, the Politische Gemeinde Trüllikon and the Bürgergemeinde Schlatt TG, and it commemorates the dissolution of the Wildensbuch civil community. The name Hochwacht refers to the hill's role in Zurich's early-warning system, where a beacon stood around 1650.

The platform is reached by 186 steps over two intermediate landings; the top platform at 33 metres holds three panorama panels and a wooden bench. Next to the tower are several seats and a display board with the tower's key data. Hiking trails lead to the tower from Wildensbuch, Schlatt, Benken ZH and Schaffhausen via the Cholfirst.

The concrete foundation holds 150 tonnes and has the coats of arms of Trüllikon and Schlatt plus the villages of Wildensbuch and Rudolfingen cast into it. The tower itself weighs about 100 tonnes, carried by four massive Douglas fir trunks.